Annex to technical regulation for thermal plants above 11 kw

Transcription

1 for thermal plants above 11 kw Exemptions for plant category A2 1 Published UK edition DATE FBN KDJ JMI JBO NAME REV. DESCRIPTION PREPARED CHECKED REVIEWED APPROVED 14/ Energinet.dk Doc. 14/ Classification: offentlig/public 1/9

2 Revision view Revision view Section no. Text Revision Date All sections Consultation document submitted for public consultation (document not available in English) , 2.1.1, 3.1, 3.2, 3.3 Added P n, asynchronous generator added in text Doc. 14/ Classification: offentlig/public 2/9

3 Contents Contents Revision view... 2 Contents Terminology, abbreviations and definitions Objective, scope and regulatory provisions Exemptions from technical requirements in POC... 8 Doc. 14/ Classification: offentlig/public 3/9

4 Terminology, abbreviations and definitions 1. Terminology, abbreviations and definitions 1.1 Abbreviations This section contains the abbreviations used in this document f R f R denotes the frequency at which a plant is to begin downward regulation with the agreed droop P current P current denotes the current level of active power P min P min denotes the lower limit for active power control P n P n denotes the rated power of a plant POC Point of Connection Point of Connection (POC). 1.2 Definitions This section contains the definitions used in this document Plant A unit which produces three-phase alternating current and where there is a direct functional correlation between the unit's main components. In case of doubt, the transmission system operator decides whether a plant can be considered as consisting of one or more plants under the rules of this regulation Plant owner The plant owner is the entity that legally owns the plant. In certain situations, the term company is used instead of plant owner. The plant owner may hand over operational responsibility to a plant operator Plant categories Plant categories in relation to total rated power at the POC: A1. Plants up to and including 11 kw A2. Plants above 11 kw up to and including 50 kw B. Plants above 50 kw up to and including 1.5 MW C. Plants above 1.5 MW up to and including 25 MW D. Plants above 25 MW or connected to over 100 kv Power Factor (PF) The Power Factor, cosine φ, for AC power systems indicates the ratio of active power P to apparent power S, where P = S*cosine φ. Similarly, the reactive power Q=S*sinus φ. The angle between current and voltage is denoted by φ. Doc. 14/ Classification: offentlig/public 4/9

5 Terminology, abbreviations and definitions Power Factor control Power Factor control is the control of the reactive power proportionately to the active power generated Electricity supply enterprise The electricity supply enterprise is the enterprise to whose grid a plant is electrically connected. Responsibilities in the public electricity supply grid are distributed across several grid companies and one transmission enterprise. The grid company is the company licensed to operate the public electricity supply grid of up to 100 kv. The transmission enterprise is the enterprise licensed to operate the public electricity supply grid above 100 kv Frequency response Frequency response is the automatic upward or downward regulation of active power as a function of grid frequencies above or below a certain frequency f R with a view to stabilising the grid frequency. Note 1: LFSM-O, Limited Frequency Sensitive Mode Overfrequency. The operational mode in which a plant reduces active power if the system frequency exceeds a set value. LFSM-U, Limited Frequency Sensitive Mode Underfrequency. The operational mode in which a plant increases active power if the system power drops below a set value Public electricity supply grid Transmission and distribution grids that serve to transmit electricity for an indefinite group of electricity suppliers and consumers on terms laid down by public authorities. The distribution grid is defined as the public electricity supply grid with a maximum rated voltage of 100 kv. The transmission grid is defined as the public electricity supply grid with a rated voltage above 100 kv Q control Q control is the control of reactive power independent of active power generated Droop Droop is the trajectory of a curve which a control function must follow Transmission system operator (TSO) Enterprise entrusted with the overall responsibility for maintaining security of supply and ensuring the effective utilisation of an interconnected electricity supply system. Doc. 14/ Classification: offentlig/public 5/9

6 Objective, scope and regulatory provisions 2. Objective, scope and regulatory provisions 2.1 Objective The objective of this annex to technical regulation is to specify exemptions for A2 plants that use asynchronous generators and are connected to the public electricity supply grid New plants The exemptions apply to all plants with asynchronous generators with a rated power above 11 kw up to and including 50 kw connected to the public electricity supply grid and commissioned as of the effective date of this annex. 2.2 Statutory authority The annex is issued pursuant to Section 7(1)(i), (iii) and (iv) of Danish Executive Order no. 891 of 17 August 2011 (Executive Order on transmission system operation and the use of the electricity transmission grid, etc. (Systemansvarsbekendtgørelsen)). Under Section 7(1) of the Executive Order on transmission system operation and the use of the electricity transmission grid, etc., this annex has been prepared following discussions with market participants and been subject to public consultation before being registered with the Danish Energy Regulatory Authority. This annex is effective within the framework of the Danish Electricity Supply Act (Elforsyningsloven), see Consolidated Act no of 25 November 2013 as amended. 2.3 Effective date This annex is effective as of 1 May 2017: Please direct requests for additional information and questions relating to this annex to Energinet.dk. Contact information is available at The annex was registered with the Danish Energy Regulatory Authority pursuant to the provisions of section 26 of the Danish Electricity Supply Act and Section 7 of the Danish Executive Order on transmission system operation and the use of the electricity transmission grid, etc. As regards plants, the construction of which was finally ordered in a binding written order before this annex was registered with the Danish Energy Regulatory Authority, but which are scheduled to be commissioned after this annex comes into force, an exemption can be applied for in accordance with section 2.9 of technical regulation for thermal plants above 11 kw, and any relevant documentation should be enclosed. 2.4 Complaints Complaints about this annex may be lodged with the Danish Energy Regulatory Authority, Doc. 14/ Classification: offentlig/public 6/9

7 Objective, scope and regulatory provisions Complaints about the transmission system operator's enforcement of the provisions of this annex may also be lodged with the Danish Energy Regulatory Authority. Complaints about how the individual electricity supply enterprise enforces the provisions of this annex may be lodged with the transmission system operator. 2.5 Normative reference 1. Technical regulation TR 3.2.3: "Technical regulation TR for thermal plants above 11 kw", dated 10. January 2017, document no. 14/ Doc. 14/ Classification: offentlig/public 7/9

8 Exemptions from technical requirements in POC 3. Exemptions from technical requirements in POC The following exemptions apply to A2 plants with asynchronous generators. References used in this section refer to TR for thermal plants above 11 kw. 3.1 Frequency response in the event of overfrequency, cf. section A2 plants with asynchronous generators can implement frequency response in the event of overfrequency with an approximate droop consisting of minimum four set points, with the first set point and related first reduction of active power at the frequency 50.2 Hz, F R, and the plant's current active power level, P current. The following three set points are distributed equally between F R and 52 Hz, reducing current active power by max. 25 % of P n in three downward steps to any minimum level of active power, P min. If the grid frequency exceeds 52 Hz, the plant must disconnect. This means that the response can be realised using minimum four steps instead of a variably adjustable droop. Power levels for the four set points must be met with a ± 10 % accuracy. When the grid frequency increases and is either identical to or greater than F R, P current must; be maintained, in the event that the frequency does not exceed FR, or be regulated downwards in the event of an increase in the grid frequency until the grid frequency has stabilised and is below F R. Following an incident in the public electricity supply grid, which has resulted in a downward regulation of the plant s active power, the plant cannot regulate upwards again until voltage is within the normal operating voltage range and frequency is in the Hz range. Compliance with this exemption can be documented with relevant functional specifications supplemented with accurate and plant-specific test documentation. The test can be done by the manufacturer and is not required to be performed or validated by a third party. 3.2 Q control, see section A2 plants with asynchronous generators are not required to have a Q control function. This exemption requires that the plant owner makes an agreement with the relevant grid company concerning the lack of a Q control function. This is a time-limited exemption, valid up to and including 4 May Thus, the Q control function requirement will apply to A2 plants with asynchronous generators connected to the grid under TR after 4 May Doc. 14/ Classification: offentlig/public 8/9

9 Exemptions from technical requirements in POC 3.3 Power Factor control, see section A2 plants with asynchronous generators are not required to have a Power Factor control function. This exemption requires that the plant owner makes an agreement with the relevant grid company concerning the lack of a Power Factor control function. This is a time-limited exemption, valid up to and including 4 May Thus, the Q control function requirement will apply to A2 plants with asynchronous generators connected to the grid under TR after 4 May Doc. 14/ Classification: offentlig/public 9/9